Patent GB-189914819-A (GB)
Title: Improvements in Printing Machinery.
Inventor: NEWTON HENRY EDWARD
Filed: 1899-07-18
Granted: 1900-03-10
Abstract: 14,819. N e w t o n, H. E., [Hoe, R.]. July 18. Rotary machines stopping and starting arrangements; inking-apparatus; lithographic a n d l i k e printing. - Relates t o various improvements in letterpress and zincographic or surface printing machines. (1) Means for rotating the impression or sheet-receiving cylinder, gradually stopping it to take the sheet from the feed-board, and starting it with an accellerating motion. Fig. 1 shows in side elevation a machine having a forme cylinder B, which may be adapted for a letterpress or a zincographic &c. forme, and an impression cylinder C. The cylinder B is driven by gears 11, 12 from a cam shaft 3, driven by a pinion 10 on the shaft 2. On one or both ends of the cylinder C i s a toothed segment 30 adapted to gear with the segment 31 (or the wheel 12) on the cylinder B, so that the cylinders B and C are geared together through the printing movement. The cylinder C is gradually started before the segments come into gear, and gradually stopped when they run out of gear, by means of two levers 20, 21 pivoted at 4, 5 on the end of the cylinder and operated by a fixed cam-groove 60, with which the rollers 6, 7 on the levers 20, 21 engage. The f o r k e d ends of these levers 20, 21 engage rollers or studs 8, 9 on the cylinder C. To assist in stopping the cylinder, a brake-wheel and band 61, 62 may be provided, and be operated by the lever 63, rod 65, and cam 66. The cylinder C may be positively stopped, and held during its interval of rest, by a forked lever 70 operated by a cam to engage and disengage a stud 1 on the brake-wheel 61. Suitable inking and, when required, damping mechanisms are applied to the roller B. The sheets may be delivered by the delivery roller 44 and fly 43 in a usual manner. The impression or sheetreceiving cylinder of cylinder or other printing-machines may be d r i v e n as described above (2) Cylindertripping and inking mechanisms. Fig. 10 shows in side elevation a machine having the stopping and starting levers 20, 21, &c. as described above with reference to Fig. 1. The segment on the shaft J of the cylinder C is attached to a wheel or piece separate from the cylinder. The cylinder is connected so as to move with the segment by means of a shaft journalled in the cylinder ends and having an arm with a lug engaging a notched flange on the segment-wheel. This shaft may be operated by a hand or other tripping-lever to disconnect the cylinder from its driving-wheel, and means are provided for holding the cylinder at rest when so disconnected. Means are also provided for preventing the operation of the tripping-lever when the segment and cylinder are being driven by the cylinder B. The inking-rollers R<3> are supplied with ink by rollers V<1>, V<11> from the drum V. which is supplied by a roller Y vibrating between it and the duct roller U. In order to cause the roller V<11> to transfer a larger quantity of ink, the roller V is lifted at intervals from the rollers R<2> by arms geared to the rock shaft u on which are the arms carrying the roller Y. The inking-rollers R<2> are lifted to clear the forme or plate when inking-up, by fevers s', s<11> pivoted on a lever s at each side of the machine and operated by cams S to engage and move studs r on sliding brackets R, R' carrying the rollers R<2>. The levers s are provided with segments gearing with segments on an operating-shaft by which the levers s may be moved to place the levers s<1>, s<11> in inoperative or operative position. A further movement of the levers s brings inclines s<111> into engagement with the rollers r, to permanently lift the rollers R<2> when the machine is stopped &c. (3) An arrangement is described for automatically lifting the inking-rollers when the machine is stopped. This comprises a train of gearing connecting the loose pulley with the segments on the lifting-levers s, Fig. 10. The gearing includes a clutch which is engaged when the belt-shifting lever is operated, and is automatically disengaged when the lifting-levers are moved far enough to lift the rollers. (4) A machine for perfecting sheets is described, having two printing and two impression cylinders. The first impression cylinder is operated so as to be gradually stopped for the feeding of the sheet to it, and gradually started and driven by mechanism similar to that described above with reference to Fig. 1. The second impression cylinder is driven continuously, and may be lifted to clear the ink plate, or the ink plate may be of reduced radius so as to clear the impression cylinder. (5) A modified form of this machine is described for giving two impressions, in different colours if desired, on one side of the sheet. A transfer cylinder is placed between the two impression cylinders, by which the sheet is transferred to the second cylinder with the once-printed side outward. (6) The sheets, instead of being fed direct from the feed-board to one of the impression cylinders, may be fed to a feeding-cylinder, and the impression cylinder or cylinders driven continuously. The feeding-cylinder may be gradually stopped and started and driven by mechanism such as that described above with reference to Fig. 1. (7) Fig. 27 shows a perfecting-machine having two printing-cylinders Band 80, and two impression cylinders C and 81, driven continuously, and a feed-cylinder 94 which receives the sheets from the feed-board 50 and feeds them to the cylinder C. The cylinder 94 is geared to a wheel 95, loose on the cylinder shaft, driven by a segment on the cylinder B and stopping and starting levers 20, 21. The levers 20, 21 co-operate with two sets of studs or rollers 97, 98 on the wheel 95. To stop the cylinder 94 accurately, a pin 100 thereon is engaged by a stopping-lever 99 operated by a rod 102 and cam 101 on the cam shaft 91. (8) A modification of the machine shown in Fig. 27 is described for making two impressions on one side of the sheet, in which a transfer cylinder is placed between the two impression cylinders. (9) Fig. 37 shows a section through the cylinders of a two-colour machine, in which the two plates or formes occupy the parts 210, 211 of the cylinder 204. There are two impression cylinders C, 81 co-operating respectively with the formes 210, 211, and a transfer cylinder 216 between them. The cylinder C receives the sheet from the feed-board, and is driven at variable speed, preferably by starting, stopping, and driving mechanism including the levers 20, 21 and cam 60 &c., which is similar to that described above with reference to Fig. 1. The cylinder C makes two revolutions, one to make the impression and the other to deliver the sheet to the cylinder 216. The cylinders 81, 216 are driven continuously from the cylinder 204. The printing-surfaces 210, 211 are respectively inked by sets of rollers 239, 240. These are mounted in sliding brackets operated by cams &c., so that each set is raised to clear the forme it is not intended to ink. (10) Means for straining and holding flexible printing-plates on cylinders or other carriers, more particularly intended for use in narrow openings in cylinders and for straining the various parts of the plate independently. These devices are also applicable for straining backings or blankets &c. on impression cylinders. Fig. 41 shows an arrangement in which the cylinder or carrier B has a gap in which is a shaft 301 journalled in end plates 300 fixed to the cylinder by bolts &c. On the shaft 301 are a number of jaws 303 independently adjustable angularly on the shaft by screws 3U6 passing through eyes 304 on the jaws and screwing into lugs 305 fixed on the shaft 301. The edge of the plate S may be clamped on to the jaws 303 by jaws 307, which may be pivoted or otherwise arranged on the jaws 303 and operated by screws. By turning the screws 306 each pair of jaws 303, 307 may be independently adjusted to strain the various sections of the plate as desired, and the shaft 301 may be turned to strain the plate as a whole. The shaft 301 is held in its adjusted position by a ratchet and pawl 308, 309. The opposite edge of the plate S may be held by another set of straining-jaws, or by other suitable means, such as clamping-arms 310 operated by springs 315 to grip the plate against the edge of the gap. Pins 316 fixed in the cylinder pass through holes in the plate S and in the jaws 310. A number of modifications in the details and arrangements of the jaws and clamping-devices are described in the Specification and drawings.